Cinema = new Mongo.Collection('cinemas');              //电影院  
Hall = new Mongo.Collection('halles');                 //放映厅
Movie = new Mongo.Collection('movies');                //电影
Screening = new Mongo.Collection('screenings');        //上映中
CheckedSeats = new Mongo.Collection('checkedseats');    //被选座位
Order = new Mongo.Collection('orders');                //订单